Dear all
I am looking for rotor bow shaft correcting procedure for gas turbin ge fram 5 . We have been suspected to rotor bow shaft after stopping machine with out respect cooldown procedure .any experience and opinion will be appreciate.
Best regard
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If there is no rubbing, particularly blade rubs, try putting it on turning gear (or jogging).
@Registered Member posted:If there is no rubbing, particularly blade rubs, try putting it on turning gear (or jogging).
Dear william
We have done bore scope check no sign of rubbing seen. How should be condition of turbine before put on turning gear?i mean hot or cold start ?i think we need some hot start and stop and putting on turning gear between each step to get better result .but we don't have specific procedure based on GE vendor .
Thanks for sharing your comment
If you have been down since the time this was posted, this would be a cold start. Borescope cannot see all places that the turbine can rub; on gear you may be able to hear a rub--you might go in the exhaust or inlet (if it is not deafining). Not seeing any rubs, is a good sign to place the unit on turning gear (jogging, whaterver you have). (Once someone described to me the rubbing sound on a turbine as whales mating--I wonder how they knew.)
You do not have a specific procedure from the vendor. Have you made an official inquiry?
@Registered Member posted:If you have been down since the time this was posted, this would be a cold start. Borescope cannot see all places that the turbine can rub; on gear you may be able to hear a rub--you might go in the exhaust or inlet (if it is not deafining). Not seeing any rubs, is a good sign to place the unit on turning gear (jogging, whaterver you have). (Once someone described to me the rubbing sound on a turbine as whales mating--I wonder how they knew.)
You do not have a specific procedure from the vendor. Have you made an official inquiry?
We haven't made any inquiry. We just referring to operating manual which mentioned if your shaft suspected to rotor bow , turning at least one hour turning gear . We have done it but vibration has not decreased . Can we conclude bended shaft or permanent bowing ?
